Clamping strap



Sept. 21 1926.

'G- E. GRUNDY CLAMPING STRAP Filed ,June 28, 1926 ATTURNE';

Patented Sept. 21, 1926.

UNITED STATES PATENT OFFlCE.

GEORGE EDMUND GRUNDY, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE THOMAS &BETTS 00., OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEVJ CLAMPINGSTRAP.

Application filed June 28, 1826. Serial No. 118,344. 5

This invention relates to a device in the form of a clamping strap,particularly adapted for use in the electrical trade, for clamping Wireconduits, either metallic .or nonmetallic, armored conductors, or nonmetallic cable, etc.

So far as I am aware, it has been the practice in the past to use strapsor clamps which have been formed upon a punch press, or other suitablemachine, and which clamps are quite rigid in their construction. Clampsof the kind which I have just described are more or less expensive andbulky, relatively speaking, and not readily carried in a Workmanspocket, in quantity.

It is one of the objects of my invention to provide a clamping strapwhich is much cheaper to make, and one that is lighter and of such anature that a large number of them can be packed into a box or package,thereby ralucing transportation expenses, furthermore a large number ofthem can be very easily carried by a Workman in his ket, so that he willhave straps readily at hand to carry on the Work of installing theconduits or cables etc.

Another object of my invention is to pro vide a clamping strap which isadapted to take different sizes of conduits or cables, thereby makingthe strap a universal one.

Another object of my invention is to pro vide a strap which lends itselfto quick and easy installation for all sizes of conduit and cable.

A further object is to provide a strap carrying means which act to lockthe strap in position on the surface carrying the conduit or cable andat the same time to lock the strap holding means in fixed position.

These and other objects will be apparent to one skilled in thisparticular art, after a study of the specification taken in connectionwith the annexed drawing, wherein:

Figure 1, is a plan view of my clamping strap.

Figure 2, is a side VlQW of. Figure 1.

Figure 3 shows the strap bent over an armored cable ready to drive theclamp hold ing means into final position.

Figure 4- is a view similar to Figure 3 showing the clamp embracing anon-metallic covered cable.

Figure 5, is a section on the line 55 of Figure 4.

Figure 6, is a view showing how the clamps are assembled in packages forshipment or handling. I. Figure 7, is a view showing a modified rorm o'tclamp.

Figure 8 shows one wa 0% u clamps in practice, whereb a. number clampsare initially surface to which the (31 previous to laying the .Oidlditor cable in position, the latter being shown in dotted lines. 7

Referring; now to t numbers refer lizing the of the 1e details, whereinlike to col-re ingparts in the varioijis Views, 1 is a c f relativelythin metal, prcferal eel, so that the same may he ie I by the lingersthe operator. In. ore c oi. the chimp 1, 1s a hole 2, and in the ouierend a series of indentations 3. The hoic 2, is adapted to receive clampSGCGJ'lUP means e'i, which ma'v be a 6d. or other co en nail. Preferablythe hole is large enough to provide clear ance for the nail i As shownin Fi urc 3. the clamp 1, is bent around a steel .iored conduit 5.earl-vin the usual (*OlKlilCiOrS ii and T, insulated 2; well-knownmanner.

In attaching the armored cable 5, to a wood surfare such as thefran'iework of abuilding, the strap 1, is of such a character that itcan be p ickly bout with the fingers around the cable and the nail 4-. k

inserted surface 8.

it wiil be apparent that in the act of periterating the indentationsnail 4t, throu h. tl' .tthe e tation will act as wed -.p into the nail4,, to prevent the sa. e from being: readilv withdrawn or shaken loose.In addition to the indentat ons I may also use a supplementalindentation 9 as shown in Figures iand 5. A

In Figure 7. the strap 1, is shown with av d pressed portion 10, and theindentations are termed downwardly from the depression 10. therebygiving; a modified form of gripping surface for the end of the strap.

Figure 8, shows a plurality of straps 1,

y driving the of the inden- 'uicil on the which may lje applied. to theneed support 8, previous to laying the conduit or con ductor inposition. and quickly done by l the member 8, am e a indentations with ahammer, pressing these into the Wood that 1 number of straps are thusheld in place, the conduit 0 i nd the cable can be ti on aid end ha 'inga hole 2, j the conduit or cable, and home as above descr'ael.

Figure 6, shows ho? the straps fsembled for shipment pr r oses, or forthe use of the operator. bundle of of these occupy an extremely snrallspace and therefore a large number of he straps may be anyinconvenience; of course, it is obvious that the size of the packagesmay be variec to suit conditions.

From what has been SElC my invention will be rea ily appreciated M 1 .in

and understood WlbllOlLi .Ll. inter description.

li aving thus described my invention,

what i 1. Ir crevice of th prising a relatively adapted to be bent byhan i: to be clamped, one end .35. v a hole the em and th t 'p having aplurality t: tions or engaging the surface to which the onecfi is to bfastened, said indentations ig'r t led by member driven theret drivenmember being gri )ped the perforated bile substanthe purpose des ihee.

the class descrio d, comstrip hav- 'elv thin metallic one end oi.indentation;

iii n," into a supporting or mber,

sale strip adapted to be readily l ent by the ope ator. over an objectto be clamped, said intlentatiins being adapted to selectivelypcrtaratec. by a member driven therethr ugh and passing through theopposite bent-over-end of the strip, r

' iereby the object is securely held by the strip. Means for clampin anelectr l cable, compris a norn all llltlLlllC strip =1Yl11fi an openingin one end and a plurali v or indentations at the other end. sa'd stripbeing readily formed by hand into loop over the cable, saic loop beingdrawn into engagement with the cable and fastened to a support by a menb r driven through said opening in the strip and through one of theselected indentations, substantially as described.

-l. Means for clamping an electrical cable, comprising; a normally flatmetallic strip having an opening in one end, and a ph rality of indextations at the other end, said strip adapted to be temporarily attachedto a support member by a blow on the strip over the indentations. saidstri) eing readily bent over the cable after it is put into positionover the strip, and a member driven hrough said opening and a selectedone of the indentations into the support.

:3. Clamping means for an electr'cal cable comprising; a flat metallicmembe' adapted to be bent into a loop by hand over the cable and amember passing through both ends of the loop alongside the cable into asupp rt, raid member being forcibly driven through the strip and grippedby the meta around the edge of the hole broken through strip at least atone end 0' the loop sub- :itiall as and for the purpose described.

A. clamping strap comprising a strip of n'retal bendable by hand aroundthe objectto be clan'ipcd having a clearance opening in one ent. and aplurality of indentations at the other end, said strap being held inposition by a member passing through the opening and driven through aselected one of said perforations into a support.

As an article of manufacture, a clamp ing strap for an electrical cablecomprising; a that st 'ip of meta]. adapted to be stacked into a compactbundle for shipment and handling: each of said strips having a open- 'ugin one end and gripping indentations at the other end, each of saidstrips being readily bendable by hand into a l op over the cable andheld in position by a nail driven through the opening and one of saidindentations.

S. A universal electrical cable st ap comn'ising; a normally flat stripof metal easily bendable by hand over the cable, said strap iaving anopening in one end and a plural of indentations longitudinally spacedrem the other end, said indentations being such that a nail positionedin said opening, may be readily driven through a selected indentationdepending on the diameter of the cable, into a support to draw the endsof the strap together over the cable.

In testimony whereof, I aliix my signature.

GEORGE EDMUND GRUNDY.

